These are the only two things I know of that could have caused this... Sunday I was changing a tire which was really difficult, and I almost had a nasty swap at the track. Monday I woke up and my right side right underneath my lower right ribs was killing me. If I had to use the muscles on that sides to stabilize myself or to lift myself up (like out of bed) it feels like someone is sticking a knife in my side. Also if I push in on that side it feels the same way. It has been 5 days and is not one bit better. I did not notice anything at all Sunday, but Monday I woke up and it was killing. Last time I pulled a muscle in my stomach it made me feel more "sick" rather than pain. This feels like a knife in my side. I have a big race this weekend and would prefer not to deal with this. It only hurts though if I apply a torque to my upper body, or have to use the right side to lift myself up, or if I apply pressure to it. Also on a side note I've been eating a lot of pineapple, and I was reading how it prevents blood clotting. I'm not sure if anything crazy is going on inside of me or not. Any help is appreciated. Thanks!!!